Question 408711
Tickets to a local movie were sold at $4 for adults and $2.50 for students. If 59 tickets were sold for a total of $222.50, how many student tickets were sold?

$4 for adults 
$2.50 for students.
59 tickets were sold 
total of $222.50, 

adults x
students y
x+y=59.............1
4x+2.5y=222.5......2
...
multiply (1) by -4

-4x-4y=-236
add to (2)
-4x+4x-4y+2.5y=222.5-236
-1.5y=-13.5
/1.5
y=9 students tickets
adult tickets = 50